Ore-roasting furnace.



G. F- RENDALL. ORE ROASTING FURNAGB.

APPLIOATION FILED JUNE 1, 1902 v A m n v lio MODEL.

. Witwe/aseo l No. 724,942. 'Y 4PATENTE) APR. '7, 1903.

G. P. RLNDALL ORB ROASTING PURNAGE.

APPLICATION FILED JUNI: '1, 1902.

No MODEL. Y a SHEETS-SHEET z.

UNITED STATES PATENT OFFICE.

GFORGEiF. RENDALL, OF NEW YORK, N. Y.

ORE-ROASTING FU'RNACE.

sPEcIFcATIoN forming part of Letters Patent No. 724,942-, dated April 7,190e. Application fled J'une 7,1902. Serial No. 110,602- (No model.)

T0 all whom t may concern:

Be it known that I, GEORGE FREDERICK RENDALL, a subject of the King ofGreat Britain, residing in the city, county, and State of New York,haveinvented anew and useful Improvement in Ore-Roasting Furnaces, ofwhich the following is a specication.

'A My invention consists of an improved constructionv ofan ore-roastingfurnace wherein the ore is treated in an expeditious and eco-Y nomicalmanner; and it consists of the'novel features of construction, whichwillbe hereinafter fullyset forth, and pointed out in the claims.

Figure 1 represents a longitudinal sectional view of an ore-roastingfurnace embodying my invention, the section being taken on line ma, Fig.2. Fig. 2 represents a section on line y y, Fig. 1. Fig. 3 represents anend elevation of Fig. 1. Fig.14 represents a sectional view showing thehopper and its adj uncts.

Similar numeralsof reference indicate corresponding parts in thefigures.

1 designates the hopper of the furnace, in to which any kind of oresuitably crushed and containing volatile material is introduced, saidore beingforced into the upper retort 2 by any suitable conveyer, as 3,mounted on the shaft 4, which is journaled into suitable bearings andactuated, when desired, by the hand-wheel or other device 5. The oreupon entering the upper retort 2 is propelled 1onv gitudinally thereof,in the present instance from le'ft to right, as seen in Fig-l, by meansof a conveyer or agitator consisting of theY shaft 6, which has suitablebearings in the ends of said retort and which is further provided withball-bearings consisting of the large roller 7, which rests upon thesmaller rollers 8 and 9, which latter freely revolve in a suitable case10, this construction of ballbearings being employed at each end of theshaft 6, and as the construction of each is substantially the same adescription of one will suffice for all.

The shaft 6 is provided with a series of wings or blades 11 and 12,which are arranged in staggered order, as will be understood from Figs.1 and 2, it being understood that the blades 12 are turned axiallyslightly with respect to the shaft 6, as will be understood from Fig. 1,whereby the ore is propelled and agitated and notpermitted to settle atany one point, whereby matting is prevented.

The ore is propelled from left to right 'in thepresent instance, as seenin Fig. 1, until it reaches the opening 13, through which it passes intothe retort 14 and is propelled from right to left therein by an agitatorand conveyer 15, mounted on the shaft 16`and constructed substantiallylike the agitator seen in the retort 2. The ore on vreaching l theleft-hand end of theretort 14 is -propelled through the opening 15X intothe retort 16X, wherein it is propelled from left toright by theagitator or conveyer 17, mounted on the shaft 19, until it reaches thedischargeopening 18, where it is received and withdrawn by anysuitablemeans. l The shafts 16 and 19 are provided 'with ball-bearingdevices at each end 20and 21, respectively, which are of the samegeneral construction as the ball-bearing devices described withreference to the shaft 6, said shafts and their adjuncts being operatedby means of power applied to the pulley 22, wherefrom it will be'seenthat the rotation of the shaft 16 is transmitted to the gear 23, thenceto the gear 24, thence tothe shaft 6, and from the pulley 25, mountedthereon, by suitable power-transmission devices 26 to the pulley 27,whereby the shaft 19 and its adj uncts are rotated, it being apparentthat the direction of rotation of said shafts and theiradjuncts is such"that the orewill be caused to travel in the directions stated, and that,furthermore, any suitable power-transmission devices may be employedother than those shown.

28 designates a pipe leading downwardly out of the upper retort 2 andhaving a steamblast discharged thereinto from the pipe 29 through thenozzle 30X, said pipe 29 having a suitable valve 30. This steam-blastcreates a draft in the pipe 28, whereby the sulfurous gases arewithdrawn and a current of induced oxygen is created through theretorts, said pipe 28 discharging into a suitable Water` or other liquidseal 29X.

-The source of heat for my improved furnace may be coal, coke, gas, orany of the petroleum products. In the present instance I have shown theretorts as being heated in a suitable reverberatory furnace, wherein 41designates the grate-bars, 31 the ash-pit, and

IOO

32 the firing-doors, the products of combustion passing from the chamber33 through the throat 34 and thence downwardly through the liuc 35 tothe stack 36 by suitable iiues and passages, which I have not deemed itnecessary to describe in detail, since their construction will befamiliar to those skilled in this art.

If desired, the hopper l may be provided with a cover 37, which may becounterbalanced by the weight 38, connected to said cover by theconnection 39, which passes over the pulleys 40.

The operation will be readily understood. The material to be treated isintroduced into the retort through the hopper and is propelled along thesame and in its passage is thoroughly heated by reason of the productsof condensation from the chamber 33 passing around the same, the orepassing through the opening 13 and into the retort 14, where a similaroperation occurs, the ore being still heated, and from thence it passesthrough the opening 15 into the retort 16X, and from thence passesthrough the discharge-opening 1S in any suitable receptacle, thesteam-blast meanwhile being operated in the pipe 28, creating a drafttherein which draws off the sulfurous `gases, which are carried to asuitable water-receptacle or liquid seal 29X, it being seen that by thisoperation the ore is thoroughly reduced to a proper condition foroperation and for permitting the escape of the gases therefrom, sincethe same is thoroughly agitated and heated as above described.

It will be evident that changes maybe made by those skilled in this artwhich will come within the scope of 'my invention, and I do not,therefore, desire to be limited in everyinstance to the exactconstruction herein shown and described.

Having thus described'my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In an ore-roasting furnace, a retort, a

conveyer suitably mounted therein, means for rotating said conveyer, asecond retort situated adjacent said first-mentioned retort, a passageforming a communication between the interior of said retorts, a conveyerin the second-mentioned retort, means for rotatingl said conveyer in anopposite direction from the line of travel of the conveyer in thefirstmentioned retort, a pipe leading downwardly from the u ppermostretort near its mid-length, a steam-blast located to discharge directlyinto the vertical portion of said pipe and a nozzle on the endA ofl thesteam-blast pipe within the pipe leading from the uppermost retort.

2. In an oar-roasting furnace, a hopper, a retort, a conveyer suitablymounted therein, means for conducting the ores from the hopper to theretort, means for rotating the conveyer, a second retort situatedadjacentsaid firstmentioned retort, casin gs around said retorts,roller-bearings in said casings for the shafts of the conveyers, aconveyer within the second retort, means for rotating said conveyer inan opposite direction in the line of travel of the conveyer in thefirst-mentioned retort, a third retort communicating with the secondretort at the end opposite its communication with the first retort, aconveyer in the lastmentioned retort having its shaft mounted onroller-bearings, means for drivingsaid conveyer in a direction oppositeto the line of travel of the conveyer in the second-mentioned retort,passages forming communica tion between the interior of said retorts atalternately opposite ends, a pipe leading downwardly from the uppermostretort near its mid-length, a steam-blast located to discharge directlyinto the vertical portion of said pipe, and a nozzle on the end of thesteam-blast pipe within said pipe leading from the uppermost retort.

G. F. REN DALL.

Witnesses:

J. S. OHAnLEsoN, PETER J. MERRITT.

